Re-write equation without multiplication

Oct 2009
273
2
Hi guys,

I have an equation y = a*b + c*d

The variables are just real numbers. How can I get this equality to hold without multiplying anything together? I have tried taking the log of each side but that doesn't work.

Anyone have any thoughts?
 

Soroban

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May 2006
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Lexington, MA (USA)
Hllo, sfspitfire23!

Are you sure of the wording of the problem?
I don't think it can be done.


Rewrite without multiplication: .\(\displaystyle y \:= \:ab + cd\)
The variables are real numbers.

It might help if we knew what course this problem came from.

If the variables were natural numbers, the task can be completed.

. . \(\displaystyle \text{For example: }\:a\cdot b \;=\;\underbrace{b + b + b + \cdots + b}_{a\text{ terms}} \)


But with real numbers . . . I see no way to rewrite\(\displaystyle \pi\sqrt{3}\)
 
Oct 2009
273
2
Just a linear algebra course. My teacher wants to know whether it can be done. I don't think it can.